The Risk-to-Reward Ratio (R/R) measures how much capital you are risking on a trade relative to your potential profit. Calculating this ratio before placing an order ensures you only take setups where the mathematical probability and payout align in your favor over time.
1. The Risk-to-Reward Formula
To calculate R/R, you need three key price points:
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Entry Price: The exact price where you execute the trade.
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Stop-Loss Price: The price where you exit if the market goes against you (your risk).
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Take-Profit Target: The price where you close the trade for a gain (your reward).
$$\text{Risk-to-Reward Ratio} = \frac{\text{Entry Price} – \text{Stop-Loss Price}}{\text{Take-Profit Price} – \text{Entry Price}}$$
(Note: For short positions, flip the subtraction order to $\frac{\text{Stop-Loss} – \text{Entry}}{\text{Entry} – \text{Take-Profit}}$).
2. Step-by-Step Calculation Example
Suppose you identify a long (buy) setup on a stock:
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Entry Price: $\$100$
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Stop-Loss (Technical Support): $\$95$
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Take-Profit (Resistance Level): $\$115$
Step 1: Calculate Total Risk Per Unit
$$\text{Risk} = \$100 – \$95 = \$5$$
Step 2: Calculate Total Reward Per Unit
$$\text{Reward} = \$115 – \$100 = \$15$$
Step 3: Express as a Ratio
$$\text{R/R Ratio} = \frac{\$5}{\$15} = \frac{1}{3} \quad \text{(Expressed as } 1:3 \text{)}$$
Interpretation: You are risking $\$1$ to make $\$3$.
3. Why R/R Ratio Dictates Long-Term Success
Your R/R ratio directly determines the minimum win rate you need to remain profitable over a series of trades.
| Risk-to-Reward Ratio | Required Win Rate to Break Even | Profit Outcome at 50% Win Rate (10 Trades) |
| 1 : 1 | $50.0\%$ | $\$0$ (Breakeven) |
| 1 : 2 | $33.3\%$ | $+5\text{ R Net Gain}$ |
| 1 : 3 | $25.0\%$ | $+10\text{ R Net Gain}$ |
| 1 : 4 | $20.0\%$ | $+15\text{ R Net Gain}$ |
At a 1:3 R/R, you can lose 7 out of 10 trades ($70\%$ loss rate) and still make a profit.
4. Common Calculation Pitfalls
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Setting Targets Arbitrarily: Do not place your take-profit or stop-loss at random dollar amounts just to force a $1:3$ ratio on paper. Stop-losses must align with technical levels (support/resistance, moving averages, average true range), and profit targets must sit at realistic market structure zones.
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Ignoring Spreads & Commissions: Always factor broker fees and execution slippage into your risk calculation. A $10\text{ cent}$ spread on a tight stop-loss can significantly degrade your real-world R/R.
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Moving Stop-Losses Mid-Trade: Adjusting your stop-loss wider while in a losing position destroys your pre-calculated risk parameters and leads to uncontrolled drawdowns.